Uh, the hack seems great, the overworld is alright, but i guess that abusing glitches for completing a level is not the point of Hacking.
When you are explaining the glitches that you have to use and having a test level where you can train all the glitches. then this hack might be a good, functional hack.

This hack isn't good. I tried to play some levels, but they are really bland and boring. Doesn't feel fun at all. The overworld is really bad, and I don't like the Karoshi Mario style here. It's not as fun as it could be.

Like KotKotKotKot said, needing to abuse glitches to continue in a level is more than bad. Try a different concept. Please try to spice the level design up too. Custom palletes and decoration would do, and perhaps not overusing the original SMW graphics, as you didn't have variety at all.

I also saw some cutoff and flaws, but that doesn't matter if the hack isn't good.